The Cascadia Subduction Zone, a fracture in the earth's crust that runs offshore from northern Vancouver Island to northern California, is virtually identical to the tectonic time bombs that decimated Sumatra in 2004, Chile in 2010, and Japan in 2011. There is roughly a 30 percent chance that such a disaster could strike the Pacific Northwest in the next 50 years, with tsunamis hitting beaches along Alaska, Hawaii, Japan, Indonesia, Hong King, the Philippines, and Australia. CBC correspondent and documentary filmmaker Jerry Thompson, who has been following the story for 25 years, tells the story of this potentially devastating cataclysm, and the havoc it could unleash throughout the Pacific Rim.